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Laptop brightness doesn't change in kde SOLVED!
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cctsurf
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Joined: 12 Oct 2006
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PostPosted: Tue Jul 16, 2013 7:02 pm    Post subject: Laptop brightness doesn't change in kde SOLVED! Reply with quote

I'm running gentoo unstable and the masked nvidia-drivers and recently, the brightness controls stopped working.
It seem to me that it happened when I upgraded to gentoo-sources-3.10, but I've used my old kernel and it doesn't work now either. (so that could be wrong)
The keyboard brightness controls work just fine in the console, but not in kde (x), I don't know about other Desktop Environments because all I have installed is kde. In kde, when I press the controls or use the soft screen control, the onscreen display says the brightness is changing, but there is no change in brightness...
I'm running a lenovo t61 laptop, and the controls have always worked just fine.
Right now I'm rather confused, when I search for the problem, I find a lot about adding the acpi_osi=linux or something similar, but that hasn't helped, but I guess I haven't explored all the windows options on that...
Anyone else experiencing this?
Thanks in Advance,
cctsurf


Last edited by cctsurf on Wed Jul 17, 2013 1:00 pm; edited 1 time in total
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cctsurf
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Joined: 12 Oct 2006
Posts: 70

PostPosted: Tue Jul 16, 2013 7:17 pm    Post subject: Reply with quote

Finally found some info on it:
https://devtalk.nvidia.com/default/topic/539462/linux/-nvidia-319-12-brightness-controls-not-working-on-laptop-ubuntu-13-03-/
Seems it's a break within the nvidia-drivers code at least at that point, suprisingly, I wasn't affected until just recently (325.08)...
Any Ideas are still helpful...I suppose I could go back a few versions of nvidia-drivers...but I don't like to.
Thanks
cctsurf
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cctsurf
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Joined: 12 Oct 2006
Posts: 70

PostPosted: Wed Jul 17, 2013 3:00 am    Post subject: Laptop brightness doesn't change in kde SOLVED! Reply with quote

Simple fix:
add the following to the xorg.conf
Code:
    Option         "RegistryDwords"             "EnableBrightnessControl=1"

now it works!
Thanks
cctsurf
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